The expression that represents the total cost after the return is 4b + 3r.
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What is simplification?</h3>
To reduce a fraction to its lowest terms by canceling to the lowest common factor for both numerator and denominator or to simplify an algebraic expression by grouping and combining similar terms is called Simplification.
Given that 6b + 4r represents the total cost of the rice and beans Gabriel bought.
He returns 2 bags of beans and 1 bag of rice, the expression that represents the total cost after the return is (6b + 4r) – (2b + r).
The simplification of the expression of the total cost is given below.


Regrouping the common terms,


Therefore, the expression that represents the total cost after the return is 4b + 3r.
To know more about the simplification, follow the link given below.
brainly.com/question/12616840.